Passing flake8 for new modules.
diff --git a/Makefile b/Makefile
index 210f304..cb3eed4 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,8 @@
 
 ## New directories can be added here
 DIRS:=\
-voltha
+voltha \
+voltha/northbound/openflow
 
 ## If one directory depends on another directory that
 ## dependency can be expressed here